lib/posix/_uname.c

   1 /*      uname(3) - describe the machine.                Author: Kees J. Bot
   2  *                                                              5 Dec 1992
   3  */
   4
   5 #define uname _uname
   6 #include <errno.h>
   7 #include <fcntl.h>
   8 #include <unistd.h>
   9 #include <string.h>
  10 #include <sys/types.h>
  11 #include <sys/utsname.h>
  12
  13 #define uts_get(field, string) \
  14         if (sysuname(_UTS_GET, field, name->string, sizeof(name->string)) < 0) \
  15                 return -1; \
  16         name->string[sizeof(name->string)-1]= 0;
  17
  18 int uname(name)
  19 struct utsname *name;
  20 {
  21         int hf, n, err;
  22         char *nl;
  23
  24         /* Get each of the strings with a sysuname call.  Null terminate them,
  25          * because the buffers in the kernel may grow before this and the
  26          * programs are recompiled.
  27          */
  28         uts_get(_UTS_SYSNAME, sysname);
  29         uts_get(_UTS_NODENAME, nodename);
  30         uts_get(_UTS_RELEASE, release);
  31         uts_get(_UTS_VERSION, version);
  32         uts_get(_UTS_MACHINE, machine);
  33         uts_get(_UTS_ARCH, arch);
  34 #if 0
  35         uts_get(_UTS_KERNEL, kernel);
  36         uts_get(_UTS_HOSTNAME, hostname);
  37         uts_get(_UTS_BUS, bus);
  38 #endif
  39
  40         /* Try to read the node name from /etc/hostname.file. This information
  41          * should be stored in the kernel.
  42          */
  43         if ((hf = open("/etc/hostname.file", O_RDONLY)) < 0) {
  44                 if (errno != ENOENT) return(-1);
  45         } else {
  46                 n = read(hf, name->nodename, sizeof(name->nodename) - 1);
  47                 err = errno;
  48                 close(hf);
  49                 errno = err;
  50                 if (n < 0) return(-1);
  51                 name->nodename[n] = 0;
  52                 if ((nl = strchr(name->nodename, '\n')) != NULL) {
  53                         memset(nl, 0, (name->nodename +
  54                                 sizeof(name->nodename)) - nl);
  55                 }
  56         }
  57         return 0;
  58 }
  59
  60 /*
  61  * $PchId: _uname.c,v 1.4 1995/11/27 20:09:08 philip Exp $
  62  */